CA3290, CA3290A
Data Sheet
September 1998
File Number 1049.3
BiMOS Dual Voltage Comparators
with MOSFET Input, Bipolar Output
The CA3290A and CA3290 types consist of a dual voltage
comparator on a single monolithic chip. The common mode
input voltage range includes ground even when operated
from a single supply. The low supply current drain makes
these comparators suitable for battery operation; their
extremely low input currents allow their use in applications
that employ sensors with extremely high source
impedances. Package options are shown in the table below.
Features
• MOSFET Input Stage
- Very High Input Impedance (Z
IN
) . . . . . . . . 1.7TΩ (Typ)
- Very Low Input Current at V+ = 5V . . . . . . . 3.5pA (Typ)
- Wide Common Mode Input Voltage Range (V
ICR
) Can Be
Swung 1.5V (Typ) Below Negative Supply Voltage Rail
- Virtually Eliminates Errors Due to Flow of Input Currents
• Output Voltage Compatible with TTL, DTL, ECL, MOS,
and CMOS Logic Systems in Most Applications
Applications
•
•
•
•
•
High Source Impedance Voltage Comparators
Long Time Delay Circuits
Square Wave Generators
A/D Converters
Window Comparators
Pinout
CA3290/A (PDIP)
TOP VIEW
OUTPUT (A
1
) 1
INV. INPUT (A
1
) 2
NON-INV. INPUT (A
1
) 3
V- 4
A
1
8 V+
+
-
A
2
7 OUTPUT (A
2
)
Schematic Diagram
(ONLY ONE IS SHOWN)
BIASING CIRCUIT
FOR CURRENT
SOURCES
COMPARATOR NO. 1
V+
D
1
D
2
Q
1
+V
I
-V
I
Q
2
Q
3
1
-
+
6 INV. INPUT (A
2
)
5 NON-INV. INPUT (A
2
)
Ordering Information
PART
NUMBER
CA3290AE
CA3290E
TEMP
RANGE (
o
C)
-55 to 125
-55 to 125
PACKAGE
8 Ld PDIP
8 Ld PDIP
PKG. NO.
E8.3
E8.3
TO
COMP.
NO. 2
I
1
Q
9
50µA
I
2
Q
10
I
3
I
4
Q
11
100µA
Q
12
V
O
D
3
D
4
Q
4
Q
8
Q
15
Q
17
R
1
100kΩ
Q
7
R
2
1kΩ
Q
18
Q
16
Q
13
Q
14
100µA
50µA
Q
5
Q
6
R
3
5kΩ
C
1
5pF
V-
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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©
Intersil Corporation 1999
INTERSIL [ INTERSIL CORPORATION ]
